Sofa



FIG. 1 is a front perspective view of a sofa, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof taken from the left of FIG. 2 thereof;

FIG. 4 is a side elevational view thereof taken from the right of FIG. 2 thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a front perspective view thereof, the sofa being in an alternate position. 

The ornamental design for a sofa, as shown and described. 